Suppose you are reviewing the exchange rates for the Irish Punt (P), the Swiss Franc (SF), and the U.S. Dollar ($). You see the following quotes: P 3 per $1; SF 9 per $1. What is the cross-rate for Punts per Swiss Franc?

A.) P.133 per SF1

B.) P.333 per SF1

C.) P.667 per SF1

D.) P3.000 per SF1

E.) P9.000 per SF1

Please show work.